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Published in 2019 at "Powder Technology"
DOI: 10.1016/j.powtec.2019.01.078
Abstract: Abstract Tree-type borehole drilling and volume fracturing in underground coal mines is a new method for improving the homogeneous permeability of coal seam. A self-rotatory bit is a potentially efficient bit, which can improve the…
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Keywords:
self rotatory;
rock breaking;
water;
rotatory bit ... See more keywords